package com.zqh.readWriteLock;

import java.util.Random;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 * @author 曾庆红
 * {@code @date} 2023-10-14 14:21
 */

public class TestReadWriteLock {

    private static Lock lock = new ReentrantLock();

    private static ReadWriteLock readWriteLock = new ReentrantReadWriteLock();

    private static Lock readLock = readWriteLock.readLock();
    private static Lock writeLock = readWriteLock.writeLock();
    private static int value;

    public static void read(Lock lock){
        try {
            lock.lock();
            Thread.sleep(1000);
            System.out.println("read over");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
    public static void write(Lock lock, int v){
        try{
           lock.lock();
           Thread.sleep(1000);
            value = v;
            System.out.println("write over");
        }catch (InterruptedException e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }

    public static void main(String[] args) {
//        Runnable readR = () ->{read(lock);};
//        Runnable writeR = ()->{write(lock,new Random().nextInt());};
        Runnable readR = ()->{read(readLock);};
        Runnable writeR = ()->{write(writeLock,new Random().nextInt());};
        for(int i = 0; i<18; i++) new Thread(readR).start();
        for(int i = 0; i<2 ;i++) new Thread(writeR).start();
    }
}
